A system for increasing the power efficiency of a balanced amplifier driven antenna arrangement includes a push-pull class B power amplifier circuit (Q1, Q2) which is responsive to a periodic, time varying input signal and generates at least two output signals in response thereto. The arrangement also includes a balanced antenna (22, 24) exhibiting a relatively high impedance at the second harmonic of the input signal. The arrangement further includes at least one transmission line (20) operatively coupled between the power amplifier circuit (Q1, Q2) and the balanced antenna (22, 24) to provide the at least two output signals to the balanced antenna (22, 24). The at least one transmission line (20) has a length which is one-eighth of the wavelength of the input signal or odd multiples thereof, and thereby reflects back to the power amplifier circuit (Q1, Q2) a substantially short circuit at the second harmonic of the input signal.